Recquired elements for the transcription process: The transcribed strand of DNA molecule is the 3'-5' (also called antisense strand), which serves as a template for the synthesis of a mRNA molecule having the same nucleotide structure of the sense strand of DNA (the difference is U instead of T) RNA polymerase II: it is the enzyme that adds ribonucleotides,顺序和互补转录因子:旨在募集,引导和固定SST的RNA聚合酶II,以便转录以核苷酸+1开始。激活聚合酶的介质。启动子 + RNA聚合酶II +转录因子=转录起始复合物。